尝试使用FileProvider共享MP3文件时获取FileNotFoundException

Question

我正在尝试使用FileProvider共享存储在应用程序内部存储的原始文件夹中的MP3文件，并让用户使用他们选择的音频监听应用程序来打开共享的MP3文件。

但是，使用我编写的代码，当我尝试使用作为数据附加的内容URI执行intent时，我得到一个FileNotFoundException。 这导致FileProvider系统的其他一切都失败了。

我创建了一个MediaPlayer并让它打开我想要分享的MP3文件没有问题，所以我知道该文件存在，我的应用程序能够访问它。

在调试时，我注意到内容URI的路径似乎摆脱了/ files /目录，即使它在我使用getUriFromFile的文件中：

meditationFile：/data/user/0/com.example.selfcareapplication/files/raw/breathing_meditation.mp3

meditationFileContentUri：content：//com.example.selfcareapplication.fileprovider/raw/breathing_meditation.mp3

这是我的清单文件中的代码：

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="com.example.selfcareapplication.fileprovider"
    android:exported="false"
    android:grantUriPermissions="true">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/file_paths" />
</provider>

这是我尝试使用FileProvider的代码：

        Intent openMeditationFileIntent = new Intent(Intent.ACTION_VIEW);
        File meditationPath = new File(this.getFilesDir(), "raw");
        File meditationFile = new File(meditationPath, "breathing_meditation.mp3");

        Uri meditationFileContentUri = FileProvider.getUriForFile(this.getApplicationContext(), "com.example.selfcareapplication.fileprovider", meditationFile);
        openMeditationFileIntent.setData(meditationFileContentUri);
        openMeditationFileIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

        if(openMeditationFileIntent.resolveActivity(getPackageManager()) != null) {
            startActivity(openMeditationFileIntent);
        } else {
            Log.d(LOG_TAG, "Could not resolve activity");
        }

这是我尝试使用附加的内容URI启动intent时得到的日志：

2019-04-06 11:45:35.709 4972-4972/? D/MusicLifecycle: com.google.android.music.ui.playback.AudioPreviewActivity generated event: Activity created
2019-04-06 11:45:35.752 4972-4972/? W/MediaPlayer: Couldn't open content://com.example.selfcareapplication.fileprovider/raw/breathing_meditation.mp3: java.io.FileNotFoundException: open failed: ENOENT (No such file or directory)
2019-04-06 11:45:35.761 1844-2504/? W/ActivityManager: Permission Denial: opening provider android.support.v4.content.FileProvider from (null) (pid=1694, uid=1013) that is not exported from UID 10092
2019-04-06 11:45:35.766 1694-1776/? E/MediaPlayerService: Couldn't open fd for content://com.example.selfcareapplication.fileprovider/raw/breathing_meditation.mp3
2019-04-06 11:45:35.766 4972-4972/? E/MediaPlayerNative: Unable to create media player
2019-04-06 11:45:35.768 4972-4972/? D/AudioPreviewActivity: Failed to open file: java.io.IOException: setDataSource failed.: status=0x80000000
2019-04-06 11:45:35.810 1584-1626/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 376832
2019-04-06 11:45:35.818 1584-1626/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 376832
2019-04-06 11:45:35.820 1584-1626/? D/gralloc_ranchu: gralloc_alloc: Creating ashmem region of size 376832
2019-04-06 11:45:35.847 4972-4999/? D/EGL_emulation: eglMakeCurrent: 0xea7c5e60: ver 2 0 (tinfo 0xea7b1a10)
2019-04-06 11:45:35.901 4972-4972/? D/MusicLifecycle: com.google.android.music.ui.MusicUrlHandlerActivity generated event: Activity stopped
2019-04-06 11:45:35.931 4972-4972/? D/MusicLifecycle: com.google.android.music.ui.MusicUrlHandlerActivity generated event: Activity destroyed
2019-04-06 11:45:35.939 1684-2170/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2019-04-06 11:45:35.941 1684-2170/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2019-04-06 11:45:35.943 1684-2170/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2019-04-06 11:45:35.944 1684-2170/? D/gralloc_ranchu: gralloc_unregister_buffer: exiting HostConnection (is buffer-handling thread)
2019-04-06 11:45:35.968 1844-3656/? I/MediaFocusControl: abandonAudioFocus() from uid/pid 10069/4972 clientId=android.media.AudioManager@32b5d4dcom.google.android.music.ui.playback.AudioPreviewActivity@6726002
2019-04-06 11:45:35.969 4972-4972/? D/MusicLifecycle: com.google.android.music.ui.playback.AudioPreviewActivity generated event: Activity destroyed
2019-04-06 11:45:36.091 1844-2247/? I/GnssLocationProvider: WakeLock acquired by sendMessage(REPORT_SV_STATUS, 0, com.android.server.location.GnssLocationProvider$SvStatusInfo@9a951f4)
2019-04-06 11:45:36.092 1844-1857/? I/GnssLocationProvider: WakeLock released by handleMessage(REPORT_SV_STATUS, 0, com.android.server.location.GnssLocationProvider$SvStatusInfo@9a951f4)
2019-04-06 11:45:36.175 4775-4775/? E/GoogleTagManager: Invalid macro: _gtm.loadEventEnabled
2019-04-06 11:45:36.319 1844-1857/? E/memtrack: Couldn't load memtrack module
2019-04-06 11:45:36.319 1844-1857/? W/android.os.Debug: failed to get memory consumption info: -1
2019-04-06 11:45:36.419 4775-5006/? E/GoogleTagManager: Invalid macro: _gtm.loadEventEnabled
2019-04-06 11:45:36.487 4775-4829/? I/MediaStoreImporter: Update: incremental Success: true Added music: 0 Updated music: 0 Deleted music: 0 Created playlists: 0 Updated playlists: 0 Deleted playlists: 0 Inserted playlist items: 0 Deleted playlist items: 0 Removed orphaned playlist items: 0 Total item count: 0
2019-04-06 11:45:36.491 4775-4775/? D/MusicLifecycle: com.google.android.music.download.EncapsulatedBroadcastReceiver$1 generated event: Broadcast received with context com.google.android.music.ui.PhoneMusicApplication@a0c548d and intent Intent { act=com.google.android.music.IMPORT_COMPLETE flg=0x10 }
2019-04-06 11:45:36.609 4775-5008/? E/GoogleTagManager: Invalid macro: _gtm.loadEventEnabled
2019-04-06 11:45:36.637 4775-5000/? E/GoogleTagManager: Unsupported Value Escaping: 3
2019-04-06 11:45:36.752 1844-1955/? E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
2019-04-06 11:45:36.684 4775-5000/? E/GoogleTagManager: Unsupported Value Escaping: 3

Answer 1

我在/ res中创建了/ raw目录并在那里复制了.mp3文件

那是在您的开发机器上。

如果你不介意我的问题，创建raw /目录和创建原始资源之间到底有什么区别？

区别在于getFilesDir()指的是Android设备上的位置。 您创建的raw/目录位于开发计算机上。

不将文件移动到/ res / raw文件夹会将其转换为可以使用R.raw引用的原始资源吗？

是。 但是，这不是您的代码正在做的事情。 您的代码正在尝试使用File引用它。 原始资源是开发计算机上的文件。 它们不是设备上的文件。

您需要将原始资源（ getResources().openRawResource()等）复制到一个文件，然后您可以使用FileProvider共享该文件。